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  1. By: Watts, John
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 40
    Issue: 477
    Date: 1939-09
    Page Range: 197--201
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-
  2. By: Watts, John
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 42
    Issue: 501
    Date: 1941-09
    Page Range: 210--214
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-